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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8e32935b2d8d1f4b3a9da791d4f3a1e4132edc45ebe97681155459767c66a3' 
  AND token = 'jEGbBxRBBjHik0HOWctXstScez+8GxHq8V+mOQPpMAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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