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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda11e77187386d05121373ae9e991f713f7da44327ed9fd451576d493b03a97' 
  AND token = 't6KYcHc6CeacJ2Vge1Wgmz7iAxnaJIY5xZInG8ru6hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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