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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92799fbe6770816fb95574a1e45977d13a0001c7035da5e3b9bbf8c56737251a' 
  AND token = 'TC6vdvF6cwEA4Wc1xsO0dLy9YLI0IXB7cBiKgZyi9qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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