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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71f266f9c5bac00b5ec48ca348dc293c9a7ecc27c67350e767631200ef0b34d' 
  AND token = '/T78dmMMB8jKzVX60nw5l7oQudTIVkXYmuwK7r9UdyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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