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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1d1d0057e81deb69883c233e1fe7d8edacaae53c5d4c58455d102d273365d1' 
  AND token = '+nByGJ0B4OdVeehbnUOwrHx9F7C3SL+KZ3McFXIJVic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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