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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc0d6678bc22486865af05f084f5f8820a6aa995f5f47d6ba7c9a7f4217e742' 
  AND token = 'phhnrUH2cMTfQtwYHF67wgpaY83pT0WDHTY9xiUOuww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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