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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1590bc88dd0d8c35b6e3057d7c66a4053c32018768dcc850c5c0c6ccab93741e' 
  AND token = '4c0GFaMua/rM8pgrT0o1xemYf83CeX9Lt/qFeOmtGpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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