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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1cf3689b82c62ac946a9ee8e49d1bb9b4df270354f53ec9b489629a0854b08' 
  AND token = 'XLCZNut1LlzERThI54P+3PwGcA8poWVJoUbcx9aaA2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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