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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d675512ce1f9a6ac9d5e88b19df284ac9313783a69d6e7c74673f5a274adbf0' 
  AND token = '0QvFm3h3O6xNGhnS1DO3HbzZSjzAGmhwPFl0Y6EOMbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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