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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e9d95e985bda7db0fac7b38a1feb7bfe5c000a9d1fd6a26f549d419c96d602' 
  AND token = 'zvC+ropOM60J+9LxaGUm5JXDSbivb1TqcJDrYBIJ8C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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