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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7da8da0ca466c01d18837eedb524da180d8497721c600d1acb1a3c9a37152aa' 
  AND token = '2f58dM7qxsAPK6Lea0Lk5McwzoCpH0fyjNqbfw6KIdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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