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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a03d4befbf704e665b464c3dba77756e035b54aebe98b2522fba6493f08cf4' 
  AND token = 'f3I5ytWW3Ug0aehXzKbKO1xWFyUqiwtwRWJ7aArU7kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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