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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9523942ebded2d7df402f3232647b185e152f05ec9f35fecdd21a47e3569fc7a' 
  AND token = 'yfzfrdNqQdw1BhBWqOh5/aINecX6j5f6EFuwO4IMeBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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