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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac84f1e668c5021495da39aa579dd952c2b4a44e9c0228da0b719c050173cc70' 
  AND token = 'x2uHHS+d3incypyGZnxvcFu883PxU1eD0tFm+nJUs34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}