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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77be46e6e68af0b79151a70ba9a5cf64c6bdbef417e0dfad794f3d6c42883e1' 
  AND token = '/sB2KHESjNJJVNp0EHztsZ/5Bu+kkgS53BJWzL0trpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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