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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3d2e41ff0b199f74516a3c6487f7cddcb3bad22405cac64690e1e6e2446d3b' 
  AND token = '0+aSw2UE5ZOvSShrHFokC3jBpWdbc5F3I6aIcsLv2no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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