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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0625413ec0a47e298d1bfb7b7401a08c24461ee4d1ac54282214b6fa4c9ffe' 
  AND token = 'jD+76FkPLFw5jm7nm8U8G2Nn/JdCUzUKSci+lXnwgLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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