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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d90b8a836df394bbecf830136f7ad3f63bd26192cda2ee90c4ef12ce32bbbd2' 
  AND token = 'Bl4kICAuqTCHDRrmZ0v2norzguCRMsyolGz45xgeJsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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