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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84e0f0ed1c9f78d82d249f8c124cd6d6f039ff11cbe79817111f4a230b03ac0' 
  AND token = 'HXJmzhaehEhyIN8boRfrmNPCGvPWy6XYPFFbu+PhUe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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