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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8670517ce039101b5b1cd45dab77ce8804050fd5b7aec728986a6d04f0f708' 
  AND token = 'TBcCk282xw86pm95nZhgnwi/yMDUsu9PPVBBz9uYg04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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