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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20af14ad1a0a306cb5f8f342517ee0b0c4ce3f1ad3ed074f526f172b10abf674' 
  AND token = 'DhmUU4kgYEgRLmIOv0x3yBEx6c146KuqN0WdYphCqgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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