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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c5e5bc44e9347a34fff54b02caa9342b1219c76c634ed14fbf775651a6e49c' 
  AND token = '/5AXuU2+RrUdX9VZLARlcUzdUqAPM8NNDOlXwm6sDpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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