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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b21c3652e56ac52d5caff8f56dc61f5bdecc7ca13e20d9792f736e1fbbf3039' 
  AND token = 'YBCgKM7tPqMCUHQoVa1kv8nhLJb+6y7sEfrmpYn99Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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