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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f111090fa26917b32c49916dbec4c33aff7fb1831665fcaf92d12b6d7050d4be' 
  AND token = '5X5opfBZgzh7ciz/yoMhc/MWMkQ1mogtbJNAHKDxP7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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