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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52ef8700b2b3022ed32137fcaac23213ed4b3d0b970e802b9dcf5fb41d30ffd' 
  AND token = 'KlzQkk3+Wa4hAciFw+Sm69znJxRoVvAyHebCtLBvkj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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