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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76026676392ff9499e2978d7c5e6b6c03f3bbcc7b9488cb3bceae68f3a10b83d' 
  AND token = 'Zi+/mw+N3waIfj4TDfWHreBuh4Cjm6aaeB81NthYtQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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