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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd03c992ef34a609e266cb24c47c743361253f37f043863cc31c9764035317c8' 
  AND token = 'swRR0DNQy/1V3ppxbq+Pps3Dg6uqxXVXbgctv78hPek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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