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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d84e1a62acfc82e23eb7eed223921fd3d7c6922c9285998ac9a58e7a21a822a' 
  AND token = 'rOx/CSTCvOXtmHjF4N0lEZtCLJZI65rHM29zMek4AfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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