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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30429a73588211a03dcbe1e8d4a6337e2d4c5a26d44c33da98d45e1e43633970' 
  AND token = 'XC6AkZloLchPMgc4/QpHkP74nx3Dn+3iKk8XDbl3kSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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