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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94adecd992bebe298b81a17915fbc4df26b40d03f3258789201a8f714588198d' 
  AND token = 'x7qHPeoD//iz3jMrvkOOclb9KfYGPACILuK1M2tJDVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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