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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47b81f69b0bc956bc9a5b06b06a4adefe7d2f77a656ab5f417ff1cc4250e519' 
  AND token = 'cQ0VxzXwxSbmxfYho5syAociVS1aFYQG8cBojP1x1PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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