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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616dab679296f47cd572d81a24a2d502647bebe44be035442542ec2b1735e09c' 
  AND token = 'Q/p7jNOQ7yLHEl43kMqvK1z3Sg9NisZaeoavAqIHSdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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