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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb44c6c1fda3c4b7c18e6ed681ec953f67f9c74ebf8c53943ccf4d4760b9220' 
  AND token = 'dLz5LhLnF01i6fy7P451SQtNa0T2n1RG3/clTNzeryY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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