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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194b09bb8f00fa5f0fde51aa81a803e6cfaafa9e54d80a677097e37f77a98298' 
  AND token = 'QAKBg0l3hqU3PvWUnXXIt/S8lO83GWn2lXqQEaURk1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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