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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9732aeb574db8df94f3d2cb3aa51ab07835796fc6ddc5d2974895e71b8d5caa3' 
  AND token = '0E1FSUSeJsdPIamZaVIwVOp62ZRbWfO3fDee5u08D9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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