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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004615fb53169e59d30774290f3021b4a1cf4580589b54b90fd56216f603a37b' 
  AND token = '8hgh7+rITrU/00Lqp867eZxqQF+lCopAln5gnTgIrFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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