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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad46b9b2eec2cb6a497ebbeb3903a0d77ff70bc7cd5faeae592b837ebfaaedef' 
  AND token = '5XLsGU8ZSggao1uDqaSgea15E3UPqyVP7uJs0Idnd74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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