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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d323a1de872dfe43e5a6702e41bd8561424425167c9b9eb3bf7a1a9a7aa49b' 
  AND token = '5VJR8NCiNOKmjTo8nc0NK/vSZ75uqjetT9siZrtsOWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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