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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaab76e3c59f7490dbb923d6e134a97e53f18a7e25ab9b25224083a85842aa6f' 
  AND token = '17rU4BeRPzVhygXDsculh9QsilVWnLIGmalvCbAEcqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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