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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687621e318f8f56e2c77a35144d301f66868d448ec222605ad75140af90e75ae' 
  AND token = 'njvfNZeKiLumCfS7VDs5vZ52Cm3F5zftH4NXFbEAxGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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