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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9bcf2e30797e4fb4ba838e9d80ca6a3b999adfd9982daa50c34ee53a562674' 
  AND token = 'FA+R8BMz2E5Fd9Ts9NVVM8hxuHdjShhdrKP7Cg3s8ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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