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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef2e16dc6ae09958ef6c5eac2df351f7e629420c8d32628f3ee4ef25805fbc2' 
  AND token = 'xMX5CuQ7oPeTneL20EjM/tN3SKr9G5ebUThHjdMwFtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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