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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c52aa60dd2a3cc56d23ff6810f7510ee4aa1943c7c2dc791d75d94df2b167e' 
  AND token = 'zrFMsY4kXpdqhAfg6l1vm8KaFncy60bnFEWB1EKDJgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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