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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6585844bbb3550b10a7d93571dc7a614f48b502a09afa6aca187f381c2c408' 
  AND token = 'EKTYnMajNccoFkqghG/0rOlqJ92JNiy21q0JF+OGAI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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