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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396548ca63148baa14fbc77a17b2f96a89d551d40b277a5fea7a0ce50dd9721d' 
  AND token = 'T9pkDyyO4dMCGdC3epKVCq6tzu2KgTxBD9jfom1njec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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