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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb4d733f14f0ef5f49beaa4ee4062ed1793ce51c94d61a044d0c7fb5cb52b2f' 
  AND token = 'Qb5XVU55297gOfb1bBtoa3vVoU1HX4TE/3M8HiCCZKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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