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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416c06ad9ccc33b199ced57e26e38afeeb37fd09329bb35d8c401fee61e933f0' 
  AND token = 'kmOUv3dkeBkszu15Ig+u847EH2wo/+3uTrqoclG4V24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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