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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe64bc07b3a60f86cecfc3fbd0bd939d76dba2008f81822bbf510062e9ea12a' 
  AND token = '9JYEruqpAh7b6NVFomNOLJbbF3YaXSsdazvoxQ04Stc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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