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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d23d9c251afa9200ab2d1cc12d773a79aac736440ff1903d520e53c637ba68a' 
  AND token = 'xdcAoR0vxq6CR15Sg4P2xdkPYGG+7O45I1l8eo9o0Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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