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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9fc77b15db76e804dd84cbb511f628dd10247ece5ffc94938519cdf401213f' 
  AND token = '/mjs/1DkjjlyT18JWmG1Bf4RnylkAX0l/+BdljIc4G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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