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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c575868d0aa8512572c10a2f927857b29f2dcde4d8ea1b6f2b63e2dc833802' 
  AND token = 'FDaGZGoS5EeU5yO4ul9byXWTNNVlJ8rrXaTIb8nvEf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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