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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36f37e5ee3bca5306e9df1803d1765af55c07907962c9025df98ae718fe4c0e' 
  AND token = 'zfdsYF11SRTWt1TQZ6h8bOtkLeEJeQsxvX9Ton3KEQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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