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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd29e6490b2108c4afd930494ba37aa026cf6d2f605f5d2bba1854794f635ed' 
  AND token = 'Ub6dx9EIExSihKqYsTj8pKC8CrI5UU8b81pwiiAUUO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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