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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3986fae36b83deb4b1f6dc15ef53e457d87ee6b39b62d476b5e2b7b6e0ad3349' 
  AND token = 'mrqi2W3RrUnasm/qg625Oji1dQLVhV/z+yCLuiAf87g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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